I just added an ATI HDTV Wonder to my R5.5 backend. I have Comcast in the Philadelphia area. I just want clear QAM so I set it up as a "DVB DTV capture card (v3.x)" and left all the other settings as defaults. I set up the source channel listing to "Local Broadcast Listings" from schedules direct. I attached the two as an input connection and scanned for channels using the frequency table as "Cable" and the modulation as "Cable (QAM-256)". It seemed to scan well and found all of the channels that I expected. I quit mythtv-setup, and ran mythfilldatabase. I launched MythWeb and scheduled a manual recording on channel "3.1" with no errors in the mythtv logs. An invalid 376B (byte?) recording was produced every time. I tried other channels also with the same result.

My other tuner is a firewire connection using a SA 4250HDC and it works very well.

I searched all over for a solution. Any ideas? Where else should I look? Thanks in advance...

Last edited by tombongo on Tue Mar 10, 2009 8:44 am, edited 1 time in total.

I have spent countless hours trying everything that I could think of so far. I decided to take MythTV out of the equation and follow the old manual steps to adding ATSC channels to MythTV without the later MythTV steps.

I used scan with the /usr/share/doc/dvb-utils/examples/scan/atsc/us-Cable-Standard-center-frequencies-QAM256 input file. It found 348 channels and created a channels.conf file. I then ran the clean up script because the channel names were not clean or unique. I then ran the mencode scan.sh script. It only created two AVI files. This didn't seem like it could be correct so I decided to use mplayer to tune channels directly. I used my cable box's service menus to figure out the frequencies of each the clear QAM 256 channels. I then looked up the lines in the channels.conf that correspond to those frequencies. I then used mplayer with the corresponding "channel names" from the channels.conf file to tune and watch those channels.

Guess what, they ALL worked. So if I can tune and watch them with mplayer than why can't I with MythTV?

I was looking through the database and verified that all of the frequencies, card ids, multiplex ids, etc all looked correct. I even compared it to a friend's database with a Hauppage 1250. I can't find anything wrong. I was even looking in the MythTV backend log and all looked exactly as I would expect, but no valid recordings. I also see NO errors. Are there ways to make MythTV more verbose or other logs to look at?

Is the newer driver OK? It looks like it loaded OK. Is it safe to assume that if mplayer can do it, so should MythTV? I think that mplayer uses the video ID and audio ID, but MythtTV doesn't. Is this correct?

I hesitated to say solved, because I gave up and did a fresh install to a hard drive that I planned on upgrading to anyway. I don't consider that a real solution, but the card worked right away with no special configuration. I just added it like any normal DVB capture card. I am not sure if this will help anyone, but that was my solution...

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